<template>
  <div id="home" class="wrapper">
    <nav-bar class="home-nav"><div slot="center">购物街</div></nav-bar>
    <tab-control
      :titles="['流行', '新款', '精选']"
      @tabClick="tabClick"
      ref="tabControl1"
      class="tab-conrtol"
      v-show="isTabFixed"
    />
    <scroll
      class="content"
      ref="scroll"
      :probe-type="3"
      @scroll="contentScroll"
      :pull-up-load="true"
      @pullingUp="loadMore"
    >
      <home-swiper
        :banners="banners"
        @swiperImageLoad="swiperImageLoad"
      ></home-swiper>
      <recommend-view :recommends="recommends"></recommend-view>
      <feature-view></feature-view>
      <tab-control
        :titles="['流行', '新款', '精选']"
        @tabClick="tabClick"
        ref="tabControl2"
      ></tab-control>
      <goods-list :goods="showGoods"></goods-list>
    </scroll>
    <back-top @click.native="backClick" v-show="isShowBackTop"></back-top>
  </div>
</template>

<script>
import HomeSwiper from "./childComps/HomeSwiper.vue";
import RecommendView from "./childComps/RecommendView.vue";
import FeatureView from "./childComps/FeatureView.vue";

import NavBar from "components/common/navbar/NavBar";
import TabControl from "components/content/tabControl/TabControl";
import GoodsList from "components/content/goods/GoodsList";
import Scroll from "components/common/scroll/Scroll";

import { itemListenerMixin, backTopMixin } from "common/mixin";
import { getHomeMultidata, getHomeGoods } from "network/home";
export default {
  name: "Home",
  components: {
    HomeSwiper,
    RecommendView,
    FeatureView,
    NavBar,
    TabControl,
    GoodsList,
    Scroll,
  },
  mixins: [itemListenerMixin, backTopMixin],
  data() {
    return {
      banners: [],
      recommends: [],
      goods: {
        pop: { page: 0, list: [] },
        new: { page: 0, list: [] },
        sell: { page: 0, list: [] },
      },
      currentType: "pop",
      tabOffsetTop: 0,
      isTabFixed: false,
      saveY: 0,
    };
  },
  computed: {
    showGoods() {
      return this.goods[this.currentType].list;
    },
  },
  methods: {
    // 事件监听相关方法
    tabClick(index) {
      switch (index) {
        case 0:
          this.currentType = "pop";
          break;
        case 1:
          this.currentType = "new";
          break;
        case 2:
          this.currentType = "sell";
          break;
      }
      this.$refs.tabControl1.currentIndex = index;
      this.$refs.tabControl2.currentIndex = index;
    },
    // 监听滚动的距离
    contentScroll(position) {
      // console.log(position);
      // 1.判断BackTop是否显示
      this.isShowBackTop = -position.y > 1000;

      this.isTabFixed = -position.y > this.tabOffsetTop;
    },
    // 上拉加载更多
    loadMore() {
      this.getHomeGoods(this.currentType);
      // this.$refs.scroll.scroll.refresh();
    },
    // 获取tabControl的offsetTop
    // 所有的组件都有一个属性$el 用于获取组件中的元素
    swiperImageLoad() {
      // console.log(this.$refs.tabControl.$el.offsetTop);
      this.tabOffsetTop = this.$refs.tabControl2.$el.offsetTop;
    },
    // 网络请求相关方法
    getHomeMultidata() {
      getHomeMultidata().then((res) => {
        this.banners = res.data.banner.list;
        this.recommends = res.data.recommend.list;
      });
    },
    getHomeGoods(type) {
      const page = this.goods[type].page + 1;
      getHomeGoods(type, page).then((res) => {
        this.goods[type].list.push(...res.data.list);
        this.goods[type].page += 1;
        this.$refs.scroll.finishPullUp();
      });
    },
  },
  created() {
    // 1.请求多个数据
    this.getHomeMultidata();

    // 2.请求商品数据
    this.getHomeGoods("pop");

    this.getHomeGoods("new");

    this.getHomeGoods("sell");
  },
  mounted() {
    // 混入了
  },
  // 销毁组件时
  destroyed() {
    console.log("home destroyed");
  },
  activated() {
    // console.log("home activated");
    this.$refs.scroll.scrollTo(0, this.saveY, 0);
    this.$refs.scroll.refresh();
  },
  deactivated() {
    // console.log("home deactivated");
    // 1.保存Y值
    this.saveY = this.$refs.scroll.getScrollY();
    // 2.取消全局事件的监听
    this.$bus.$off("itemImageLoad", this.itemImgListener);
  },
};
</script>

<style scoped>
#home {
  height: 100vh;
  position: relative;
}

.home-nav {
  background-color: var(--color-tint);
  color: #fff;
}

.tab-conrtol {
  position: relative;
  z-index: 9;
}

.content {
  overflow: hidden;
  position: absolute;
  top: 44px;
  bottom: 49px;
  left: 0;
  right: 0;
}
</style>